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United States Patent | 6,024,615 |
Eichinger | February 15, 2000 |
A vibration dampening system incorporates an inertia mass that is disposed within a hollow portion of an impeller structure. The inertia mass is attached to one or more elastomeric members which are, in turn, attached to an inside surface of a tubular portion of the impeller structure. The annular inertia mass and its elastomeric legs are particularly designed to dampen and counteract a particular frequency at which the propulsion system vibrates when the internal combustion engine is operated at idle speed.
Inventors: | Eichinger; Charles H. (Oshkosh, WI) |
Assignee: | Brunswick Corporation (Lake Forest, IL) |
Appl. No.: | 120595 |
Filed: | July 22, 1998 |
Current U.S. Class: | 440/52; 440/38 |
Intern'l Class: | B63H 001/15 |
Field of Search: | 440/49,52,67,89,38 416/939,245 A 74/574 464/180 |
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4637801 | Jan., 1987 | Schultz | 440/67. |
4734079 | Mar., 1988 | Viets | 464/180. |
4884666 | Dec., 1989 | Stahl | 188/378. |
4905956 | Mar., 1990 | Zemlicka et al. | 248/562. |
4955833 | Sep., 1990 | Lam et al. | 440/49. |
4962677 | Oct., 1990 | Withers | 74/574. |
5095786 | Mar., 1992 | Bellinghausen | 82/112. |
5231893 | Aug., 1993 | Sisco et al. | 74/574. |